Shrinking again.

Hi
Has anyone had any experience shrinking a tall T Production sweatshirt. I have a "Steal Your Face Acid Wash Sweatshirt 34inch". Bought over NS and its a bit to long, wanna lose some length on it. The product is no longer on there site. However when looking at the materials of the similar hoodie version "https://talltproductions.com/shop/steal-your-face-hoodie-acid-wash/" theres:
80% Polyester
20% Cotton
so with that in mind, what should I expect and what kind of length can expect to loose?

Appreciate all responses, virtual love and karma for all helpful responses.